What are the possible causes and corrections for the condition of sudden coupling (from neutral position to drive or reverse positions) in the tran...

What are the possible causes and corrections for the condition of sudden coupling (from neutral position to drive or reverse positions) in the transmission and gearbox of a WJ vehicle?

The possible causes for the sudden coupling condition are low fluid level, incorrectly adjusted throttle butterfly joint, loose engine support bolts or transmission system, worn and broken universal joint, incorrect shaft clearance, incorrect hydraulic pressure, incorrectly adjusted belt, missing valve body balls, loose pinion flange, damaged clutch, belt or planetary component, damaged converter clutch, worn or broken reaction shaft seal rings, stuck regulator valve, and clogged cooler.
The possible corrections for the sudden coupling condition are adding fluid, adjusting the throttle butterfly joint, tightening loose bolts, replacing worn and broken universal joint, checking and correcting shaft clearance, verifying and adjusting hydraulic pressure, adjusting the belt, verifying the installation of valve body balls, replacing the pinion nut and checking the threads, repairing or replacing the transmission, replacing the converter and cleaning the cooler and tubes, replacing the worn or broken reaction shaft seal rings, cleaning the regulator valve, and unclogging the cooler.